| 摘要 |
Plotting apparatus for producing a plot or chart of the signals recorded by a surveying instrument which is traversed over the ground and produces electrical signals which vary in accordance with the electromagnetic reflection coefficient of the ground, comprising means for playing back a recording of the signal, a solenoid-operated pen arranged to mark dots on a sheet secured on a carrier with a frequency dependent on the magnitude of the signal, and means for moving the pen and the sheet carrier relative to one another correspondingly to the traversing movement of the instrument over the ground. The pen may be mounted on a carriage which is shifted laterally in steps while the sheet carrier may be a drum which is rotated slowly so long as the recording is being played back.
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